#include<iostream>
#include<cstdio>
#include<cstring>
#include<unistd.h>
using namespace std;

int main()
{
	//库函数
	printf("hello,printf\n");
	fprintf(stdout,"hello fprintf\n");
	const char *s = "hello fwrite\n";
	fwrite(s,strlen(s),1,stdout);

	//系统调用
	const char *ss = "hello write\n";
	write(1,ss,strlen(ss));

	//????
	fork();
	
	return 0;
}
